X(1835): A Possible Baryonium?

Abstract

We point out that (1) the large $p\bar{p}$ coupling and suppressed mesonic coupling of X(1835) and (2) the suppression of the three-body strange final states strongly indicate that X(1835) may be a $p\bar{p}$ baryonium. We also point out that the branching ratio of $X(1835)\to \eta \pi \pi$ should be bigger than that of $X(1835)\to {\eta }^{\prime }\pi \pi$. If BES further confirms the non-observation of X(1835) in the $\eta \pi \pi$ channel, that will be very puzzling. Finally, X(1835) may be used a tetraquark generator if X(1835) is really established as a baryonium state.

Comments and suggestions welcome

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• Near Threshold Enhancement of p pbar System and p pbar Elastic Scattering
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• What can we learn about light-meson interactions at electron-positron colliders?
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• First study of η_c, η(1760) and X(1835) production via η'π^+π^- final states in two-photon collisions
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• A possible mechanism for producing the threshold enhancement in $J/\psi \to \gamma p\bar{p}$
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• Search for the process $e^{+}{e}^{-}\to J/\psi +X(1835)$ at $\sqrt{s}\approx 10.6$GeV
• Protonium: Discovery and Prediction
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• Highlights of recent BESIII results